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episodic variation (cyclical variation)

(cyclical variation)
The tendency for young children to fluctuate through cycles or periods of developmental disfluency, followed by a return to normal fluency and then back into disfluency again. When the fluctuations increase in the direction of disfluency, this is a potential "danger sign."
Credit

Definition reprinted with permission from Hood, Stephen B. (editor) available from Stuttering Foundation of America: Stuttering Words (Publication No 2: Speech Foundation of America)

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